add convert function

Author: vanhtuan0409

utils/common.go

@@ -12,7 +12,7 @@ import (
 )
 
 // Version of rivendell
-var Version = "1.1.4"
+var Version = "1.1.5"
 
 // MergeMaps merges multiple maps into one
 func MergeMaps(maps ...map[string]string) map[string]string {

utils/templater.go

@@ -37,6 +37,7 @@ func ExecuteTemplate(templateFile string, variables map[string]string) ([]byte,
 			"hash":         hashFunc,
 			"base64":       base64Func,
 			"asGenericMap": asGenericMap,
+			"asMapString":  asMapString,
 		}).
 		Parse(contentWithEnvExpand)
 	if err != nil {
@@ -124,3 +125,16 @@ func asGenericMap(m map[string]string) map[string]interface{} {
 	}
 	return ret
 }
+
+func asMapString(m map[string]interface{}) map[string]string {
+	ret := make(map[string]string)
+	for k, v := range m {
+		if strVal, ok := v.(string); ok {
+			ret[k] = strVal
+		}
+		if strg, ok := v.(fmt.Stringer); ok {
+			ret[k] = strg.String()
+		}
+	}
+	return ret
+}